[ET Trac] [Einstein Toolkit] #737: simfactory sync can lead to inconsistent builds

[Einstein Toolkit]

#737: simfactory sync can lead to inconsistent builds
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 Reporter:  rhaas       |       Owner:  eschnett
     Type:  defect      |      Status:  new     
 Priority:  major       |   Milestone:          
Component:  SimFactory  |     Version:          
 Keywords:              |  
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 simfactory's sync command uses rsync with the --archive (-a) option. This
 option set the modification date of files on the target machine to that on
 the source machine. This can lead to inconsistent builds in the following
 situation:

 [1] local: edit source_file.c
 [2] local: simfactory sync
 [3] local: edit source_file.c
 [4] remote: simfactory build
 [5] local: simfactory sync
 [6] remote: simfactory build

 [6] will not rebuild source_file.o since [5] set the modification time to
 that of [3] which which is older than [4] hence make will not consider
 source_file.o to be out-of-date.

 A simple fix is to add --no-times to the rsync options. Unfortunately this
 disables rsync's file modification time optimization and requires it to
 compute checksums on all files which can be very slow on slow filesystems.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/737>
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